1 files changed, 25 insertions, 0 deletions
diff --git a/zeitgeist.go b/zeitgeist.go
index 2e99d91..a44f25c 100644
--- a/zeitgeist.go
+++ b/zeitgeist.go
@@ -644,6 +644,27 @@ var funcs = template.FuncMap{
 		d, e := time.Parse(time.DateOnly, in)
 		return Date(d), e
 	},
+	"Percent": func(a, b Amount) float64 {
+		return float64(a/b) * 100
+	},
+	"AsDay": func(a Amount) string {
+		return a.AsDay()
+	},
+	"AsMonth": func(a Amount) string {
+		return a.AsMonth()
+	},
+	"Unit": func(unit string, a Amount) (string, error) {
+		switch unit {
+		case "M", "m":
+			return a.AsMonth(), nil
+		case "D", "d":
+			return a.AsDay(), nil
+		case "H", "h":
+			return a.String(), nil
+		default:
+			return "", fmt.Errorf("unknown unit %q", unit)
+		}
+	},
 }
 
 func (p *Project) printReport(name string) {
@@ -960,6 +981,10 @@ func (t *Totals) Open() Amount {
 	return d
 }
 
+func (t *Totals) Difference() Amount {
+	return t.Planned - t.Done
+}
+
 func (t *Totals) Percent() float64 {
 	if t.Done < 1 && t.Planned < 1 {
 		return 0